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$\newline$David is making rice for his guests based on a recipe that requires rice, water, and a special blend of spice, where the rice-to-spice ratio is $15: 1$. He currently has $40$ grams of the spice blend, and he can go buy more if necessary. He wants to make $10$ servings, where each serving has $75$ grams of rice. Overall, David spends $4$.$50$ dollars on rice.$\newline$What is the price of rice per gram?$\newline$________dollars per gram of rice